What is an Air Source Heat Pump?
An air source heat pump (ASHP) is a low-carbon heating system that captures heat from the outside air and uses it to heat your home and hot water. Even in cold weather, outdoor air contains heat energy that can be used efficiently.
How does an Air Source Heat Pump Work?
An ASHP absorbs heat from the outside air into a refrigerant fluid. This fluid is compressed to increase its temperature and then transferred into your home’s heating system.
It works similarly to a refrigerator in reverse.
Are Air Source Heat Pumps Efficient?
Yes. Air source heat pumps typically deliver 250–350% efficiency, meaning for every 1 unit of electricity used, you can generate 2.5–3.5 units of heat.
They are one of the most efficient renewable heating options available.
How much does an Air Source Heat Pump Cost in the UK?
A typical air source heat pump installation costs £8,000-£18,000 depending on property size . With the £7,500 BUS grant, this reduces to £500-£10,500. Use our free estimate calculator for an accurate quote.
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Property size
Insulation levels
Heat pump size and brand
Radiator or underfloor heating upgrades
Are There Government Grants for Air Source Heat Pumps?
Yes. The Boiler Upgrade Scheme (BUS) provides grants for eligible UK homeowners to help reduce upfront costs.
Working with a certified installer like Thermal Earth ensures eligibility.
Do Air Source Heat Pumps Work in Cold Weather?
Yes. Modern ASHPs are designed to operate efficiently even in UK winter conditions, often down to temperatures below freezing.
How Long Do Air Source Heat Pumps Last?
Typical lifespan: 15–20 years
With proper servicing, systems can last longer
Regula care and servicing will increase the life of your GSHP.
Find out more about our comfort care plan
Are they Suitable For Older Homes?
Yes, especially when paired with:
Good insulation
Underfloor heating
Larger radiators
Older homes may need upgrades for best performance.